Shanghai AI Lab Releases Sage-A1.5: A 35B MoE Agentic Model Advancing Long-Horizon Software and Scientific Discovery
The Shanghai Artificial Intelligence Laboratory published the technical report for Sage-A1.5 on arXiv:2610.28578, introducing an open-weights 35B Mixture-of-Experts (MoE) foundation model purpose-built for agentic tasks. Building on the Agents-A1 lineage, Sage-A1.5 focuses on scaling the agent execution horizon rather than model parameters through adaptive capability composition. Tailored for complex repository-level software engineering and multi-step scientific hypothesis exploration, Sage-A1.5 consistently outperforms dense 70B+ baselines on long-horizon reasoning benchmarks while maintaining lightweight deployment footprints.

Key Takeaways
- Shanghai AI Lab published Sage-A1.5 (arXiv:2610.28578), open-sourcing a 35B MoE agentic foundation model
- Pioneers horizon scaling over raw parameter expansion, sustaining consistent focus across 100+ execution steps
- Optimized for repository-level software engineering bug fixes, matching dense 70B+ baselines on complex git issue resolution
- Features intrinsic scientific exploration and hypothesis generation capabilities, tailored for local on-prem cluster deployment